[sublynx]

"Am I correct in thinking in GWX torpedoes can travel at a minimum depth of 3m regardless of a shallower setting in the TDC??"

Not to my knowledge but of course it's hard to know for certain.

Without h.sie's mods the eels keep their depth pretty well and there are no surface runners. With h.sie one might actually rather wait for better weather than risk all of one's eels to fail in heavy seas.